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The flag has been problematic and abused by users. While perhaps its original purpose was to be able to feed a new version of the control-plane it also made it possible to apply modifications to the ClusterConfiguration object in the cluster. The lack of a feature in kubeadm for reconfiguration of running clusters resulted in users using this flag for the same purpose. While it works for certain scenarios like updating a static Pod for this control-plane only, it can result in unexpected behavior if the user has for example fed a node name different than the host name, when originally they created this node. kubeadm 1.16 introduced the "kustomize" feature that is a potential replacement for this user demand. Add warning that this flag should not be used.